| Estimation of compressive stress in intervertebral disc using finite element analysis |
| Paper ID : 1639-SSRC-13TH |
| Authors |
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Zahra Mazhar Sarmadi *1, Elham Shirzad2 1Department of Health & Sports Medicine, Faculty of Physical Education & Sport Sciences, University of Tehran 2Member of Scientific Committee |
| Abstract |
| Introduction : Intervertebral disc degeneration is a major cause of low back pain (1) .Back pain is a frequent complaint in elite athletes. The intervertebral disc (IVD) is a preponderant element in the evolution of movement and posture in humans(2). It gives stability, distributes axial load and has proprioceptive function. This study aims to characterize the deformation in intervertebral disc under compressive loading and link these to changes in the extracellular matrix with Finite Element Methods(FEM). Methods: IVD is a heterogeneous structure formed by a fibrous annulus (type I collagen) and a nucleus pulpous (collagen type II, aggrecan, elastin, water and chondrocytes-like cells).. In Abaqus Software (CAE Standard 2020), for Annulus Fibrosus and Nucleus Pulposus used Neohookean, incompressible material with C10 (material’s deviatoric stiffness )= 1MP and 0.5 MPa respectively., . In this study, assumed that the bottom surface of the disc is fixed. Total simulation considered to be 1 second and applied a uniform, smooth load with amplitude of 1 N to the top of surface of IVD. An 8-node linear brick, hybrid, constant pressure, reduced integration, hourglass control was used for constructing the mesh. Results: Due to bottom surface is fixed, the greatest Von Mises (1.173 MPa) observed at the bottom of the IVD and it decreased as get further to top surface(0.8799MPa). As get further from Annulus Fibrosus to Nucleus Pulposus, stress is decreased from 1.075 MPa to 0.5866 MPa. Conclusion : Due to the pressure is applied uniformly throughout the top of the surface, the highest amount of stress was observed in Annulus Fibrosus, so it can be concluded that Annulus Fibrosus is more vulnerable than the Nucleus Pulposus. Therefore, to prevent injury, exercise should be designed to prevent a lot of pressure on the Annulus Fibrosus . Using Finite Element methods, it is possible to predict what changes in the structure of intervertebral disc will cause improper loads, and based on that, exercise training programs can be changed to prevent sport injuries and improve athlete's championship life. |
| Keywords |
| Keywords: intervertebral disc(IVD), disc degeneration, back pain, compressive load, FEM |
| Status: Abstract Accepted (Poster Presentation) |
